basement station indoor air quality measurement

• based reason : law No.12 of indoor air quality management(indoor air quality measurement)
• maintenance standard and the measured results(how often to measure: annually)

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  maintenance standard and the measured results

  (based on year 2021)
  division	fine dust (㎍/㎥)	ultrafine dust (㎍/㎥)	carbon dioxide(ppm)	form aldehyde (㎍/㎥)	carbon monoxide(ppm)
  standard	less than 100	less than 50	less than 1,000	less than 100	less than 10
  average	37.0	18.9	403	6.4	0.7
  line1	33.3	17.5	410	6.2	0.6
  line2	40.5	21.8	409	5.0	0.8
  line3	38.4	19.5	403	10.1	0.7
  line4	35.9	16.6	390	4.1	0.6

• recommended standard & measured result(how often to measure: once every two years)

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  recommended standard & measured result

  (based on year 2021)
  division	nitrogen dioxide (ppm)	radon (Bq/m3)	volatile organic compounds (㎍/㎥)
  standard	less than 0.05	less than 148	less than 500
  average	0.033	14.9	200.6
  line 1	0.036	16.0	186.1
  line 2	0.035	13.8	223.4
  line 3	0.029	16.1	217.5
  line 4	0.031	13.5	175.5

Air quality measurement in the motor car

• based reason : Law No.9 article 2 of indoor air quality management(Measurement on Indoor Air Quality in Public Transportation Vehicles)
• measured result

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  measured result

  (based on year 2021)
  division	ultrafine dust (㎍/㎥)	carbon dioxide (ppm)
  standard	less than 50	less than 2,000(uncrowded)	less than 2,500(crowded)
  average	8.0	1,074	1,197
  line1	13.9	943	975
  line2	5.8	1,148	1,264
  line3	6.2	1,233	1,504
  line4	5.9	973	1,048

efforts to improve air quality

ventilation facility operation for the clean environment

air screening device periodic filter cleaning

• As air filter device is installed in the air inlet and the air conditioner, outdoor air can go through the filter and fresh air come in the station
• period : auto cleaning(once a day), manual cleaning(once a month), high pressure cleaning (annually)

water washing in the ground tunnel

• periodic cleaning is a must for clean and fresh environment

enhancement and exchange of old ventilation facility

• ventilation fan exchange, station ventilation duct enhancement, air filtering device exchange